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V.42 is an International Telephone and Telegraph Consultative Committee (CCITT) V-series standard that regulates error-detection for high-speed modems. V.42 permits computer modems to work with both digital and analog phone lines. It’s an error-correcting procedure for data communications equipment (DCE) that uses an asynchronous-to-synchronous conversion.
V.42 is pronounced as v-dot-forty-two.
V.42 permits receivers to request the retransmission of lost data packets, although it does not provide a guarantee about how much time it will take to deliver the error-free data to the receiving side. V.42 is generally included in dial-up modems and even includes an high-level data link control-based protocol referred to as Link Access Procedure for Modems.
The V.42 protocol includes some well-defined characteristics: